Navigate to your map in your dashboard and click "Download Shapefile" to begin the download.

Your download should complete quickly. Depending on your browser, you can usually open the containing folder directly from your toolbar. Otherwise you can navigate to your downloads folder from your file explorer.

Shapefiles are zipped files containing several file types. Unzip the file to your preferred location. The zipped shapefile comprises multiple filetypes. These files are all required to read the shapefile in a GIS program, but we only need the DBF file to create a table.

Open your spreadsheet program. 

The example here is in Excel, but the process will be similar when using other spreadsheet applications. 

Open a new sheet by navigating to your download folder (make sure you have selected "All Files" or "dBase Files" for the file type) and selecting the file with the DBF extension.

This will open your spreadsheet. From here you can edit the sheet by adding or deleting fields. You can then save it out as another file type (CSV or XLS) that can be shared without altering the data in the original DBF file in your shapefile.